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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2008, Digium, Inc.
*
* Matthew Fredrickson <creslin@digium.com>
* Russell Bryant <russell@digium.com>
*
* Special thanks to Steve Underwood for the implementation
* and for doing the 8khz<->g.722 direct translation code.
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief codec_g722.c - translate between signed linear and ITU G.722-64kbps
*
* \author Matthew Fredrickson <creslin@digium.com>
* \author Russell Bryant <russell@digium.com>
*
* \arg http://soft-switch.org/downloads/non-gpl-bits.tgz
* \arg http://lists.digium.com/pipermail/asterisk-dev/2006-September/022866.html
*
* \ingroup codecs
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/linkedlists.h"
#include "asterisk/module.h"
#include "asterisk/config.h"
#include "asterisk/translate.h"
#include "asterisk/utils.h"
#define BUFFER_SAMPLES 8096 /* size for the translation buffers */
#define BUF_SHIFT 5
#include "g722/g722.h"
/* Sample frame data */
#include "asterisk/slin.h"
#include "ex_g722.h"
struct g722_encoder_pvt {
g722_encode_state_t g722;
};
struct g722_decoder_pvt {
g722_decode_state_t g722;
};
/*! \brief init a new instance of g722_encoder_pvt. */
static int lintog722_new(struct ast_trans_pvt *pvt)
{
struct g722_encoder_pvt *tmp = pvt->pvt;
g722_encode_init(&tmp->g722, 64000, G722_SAMPLE_RATE_8000);
return 0;
}
static int lin16tog722_new(struct ast_trans_pvt *pvt)
{
struct g722_encoder_pvt *tmp = pvt->pvt;
g722_encode_init(&tmp->g722, 64000, 0);
return 0;
}
/*! \brief init a new instance of g722_encoder_pvt. */
static int g722tolin_new(struct ast_trans_pvt *pvt)
{
struct g722_decoder_pvt *tmp = pvt->pvt;
g722_decode_init(&tmp->g722, 64000, G722_SAMPLE_RATE_8000);
return 0;
}
static int g722tolin16_new(struct ast_trans_pvt *pvt)
{
struct g722_decoder_pvt *tmp = pvt->pvt;
g722_decode_init(&tmp->g722, 64000, 0);
return 0;
}
static int g722tolin_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
{
struct g722_decoder_pvt *tmp = pvt->pvt;
int out_samples;
int in_samples;
/* g722_decode expects the samples to be in the invalid samples / 2 format */
in_samples = f->samples / 2;
out_samples = g722_decode(&tmp->g722, &pvt->outbuf.i16[pvt->samples * sizeof(int16_t)],
(uint8_t *) f->data.ptr, in_samples);
pvt->samples += out_samples;
pvt->datalen += (out_samples * sizeof(int16_t));
return 0;
}
static int lintog722_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
{
struct g722_encoder_pvt *tmp = pvt->pvt;
int outlen;
outlen = g722_encode(&tmp->g722, (&pvt->outbuf.ui8[pvt->datalen]),
(int16_t *) f->data.ptr, f->samples);
pvt->samples += outlen * 2;
pvt->datalen += outlen;
return 0;
}
static struct ast_translator g722tolin = {
.name = "g722tolin",
.newpvt = g722tolin_new, /* same for both directions */
.framein = g722tolin_framein,
.sample = g722_sample,
.desc_size = sizeof(struct g722_decoder_pvt),
.buffer_samples = BUFFER_SAMPLES / sizeof(int16_t),
.buf_size = BUFFER_SAMPLES,
};
static struct ast_translator lintog722 = {
.name = "lintog722",
.newpvt = lintog722_new, /* same for both directions */
.framein = lintog722_framein,
.sample = slin8_sample,
.desc_size = sizeof(struct g722_encoder_pvt),
.buffer_samples = BUFFER_SAMPLES * 2,
.buf_size = BUFFER_SAMPLES,
};
static struct ast_translator g722tolin16 = {
.name = "g722tolin16",
.newpvt = g722tolin16_new, /* same for both directions */
.framein = g722tolin_framein,
.sample = g722_sample,
.desc_size = sizeof(struct g722_decoder_pvt),
.buffer_samples = BUFFER_SAMPLES / sizeof(int16_t),
.buf_size = BUFFER_SAMPLES,
};
static struct ast_translator lin16tog722 = {
.name = "lin16tog722",
.newpvt = lin16tog722_new, /* same for both directions */
.framein = lintog722_framein,
.sample = slin16_sample,
.desc_size = sizeof(struct g722_encoder_pvt),
.buffer_samples = BUFFER_SAMPLES * 2,
.buf_size = BUFFER_SAMPLES,
};
static int reload(void)
{
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
int res = 0;
res |= ast_unregister_translator(&g722tolin);
res |= ast_unregister_translator(&lintog722);
res |= ast_unregister_translator(&g722tolin16);
res |= ast_unregister_translator(&lin16tog722);
return res;
}
static int load_module(void)
{
int res = 0;
ast_format_set(&g722tolin.src_format, AST_FORMAT_G722, 0);
ast_format_set(&g722tolin.dst_format, AST_FORMAT_SLINEAR, 0);
ast_format_set(&lintog722.src_format, AST_FORMAT_SLINEAR, 0);
ast_format_set(&lintog722.dst_format, AST_FORMAT_G722, 0);
ast_format_set(&g722tolin16.src_format, AST_FORMAT_G722, 0);
ast_format_set(&g722tolin16.dst_format, AST_FORMAT_SLINEAR16, 0);
ast_format_set(&lin16tog722.src_format, AST_FORMAT_SLINEAR16, 0);
ast_format_set(&lin16tog722.dst_format, AST_FORMAT_G722, 0);
res |= ast_register_translator(&g722tolin);
res |= ast_register_translator(&lintog722);
res |= ast_register_translator(&g722tolin16);
res |= ast_register_translator(&lin16tog722);
if (res) {
unload_module();
return AST_MODULE_LOAD_FAILURE;
}
return AST_MODULE_LOAD_SUCCESS;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "ITU G.722-64kbps G722 Transcoder",
.load = load_module,
.unload = unload_module,
.reload = reload,
);
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